What is a "diamond cut" silk? It is a silk scarf that has been specially cut and hemmed for use by magicians. Rather than being made in the shape of a square, it is shaped like a diamond. This way it appears to be bigger and longer than it actually is. A 12" diamond cut silk seems to be as large as a standard 18" silk. Yet, because it is only a 12" silk, it will fit into a thumbtip and other small gimmicks. This makes it possible to do many strong effects in a simple manner!